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Network Diagnostic Tools

Local UI includes the ping and traceroute diagnostic tools. These tools have the same functionality as the command-line tools, but are accessible through a web interface. You can use these diagnostic tools to help troubleshoot network issues without having to establish an SSH connection to your Edge host.

In air-gapped environments, you can use these tools to verify the connection to an endpoint within the network. For air-gapped clusters with proxy or in connected environments, you can use these tools to verify the connection to an endpoint outside the network, based on the scope of the connectivity. For example, these tools are useful to check if the Edge Host can connect to the internet or an external registry or to make sure there is no external connectivity in an air-gapped environment.

Use Ping to Test Network Connection​

Prerequisites​

  • You have access to Local UI.

Use Ping to Check Connection to a Specific Endpoint​

  1. Log in to Local UI.

  2. From the left Main Menu, click Diagnostics.

  3. From the Diagnostics page, click on the Connectivity tab.

  4. Click on Ping.

  5. In the endpoint field, enter the endpoint you would like to test the connection to. For example, if you want to make sure your Edge host has connection to a image registry within your network at 10.10.153.43:8000, you would enter 10.10.153.43:8000.

  6. Click Run.

  7. If ping produces output similar to the following, you are connected to the endpoint.

    64 bytes from 10.10.153.43: icmp_seq=0 ttl=112 time=13.208 ms
    64 bytes from 10.10.153.43: icmp_seq=1 ttl=112 time=7.184 ms
    64 bytes from 10.10.153.43: icmp_seq=2 ttl=112 time=7.748 ms
    64 bytes from 10.10.153.43: icmp_seq=3 ttl=112 time=6.724 ms
    64 bytes from 10.10.153.43: icmp_seq=4 ttl=112 time=6.394 ms
    64 bytes from 10.10.153.43: icmp_seq=5 ttl=112 time=8.540 ms
    64 bytes from 10.10.153.43: icmp_seq=6 ttl=112 time=7.160 ms

    If ping produces output containing messages such as "Destination Host Unreachable" or "100% packet loss," then you are not connected to the endpoint.

Validate​

Depending on the endpoint you are trying to test, you can use other tools to validate the results of ping. For example, if you are trying to reach a REST API endpoint, you can use curl to make an HTTP request to the endpoint to validate the results of ping.

Use Traceroute to Test Network Connection​

The traceroute diagnostic tool is similar to ping, but it produces more detailed output in that it displays the route to a destination. Traceroute is useful for you to determine at which point along the path the packets are being delayed or lost.

Prerequisites​

  • You have access to Local UI.

Use Traceroute to Check Connection to a Specific Endpoint​

  1. Log in to Local UI.

  2. From the left Main Menu, click Diagnostics.

  3. From the Diagnostics page, click on the Connectivity tab.

  4. Click on Traceroute.

  5. In the endpoint field, enter the endpoint you would like to test the connection to. For example, if you are having DNS issues and want to test your connection to your DNS server at 203.0.113.4, you would input 203.0.113.4.

  6. Click Run.

  7. If traceroute produces output similar to the following, you can tell from the response which part of the network is having issues.

    traceroute to 203.0.113.4 (203.0.113.4), 30 hops max, 60 byte packets
     1  192.168.1.1 (192.168.1.1)  1.242 ms  1.013 ms  1.004 ms
     2  10.245.32.1 (10.245.32.1)  11.123 ms  10.896 ms  10.876 ms
     3  100.64.0.2 (100.64.0.2)  20.455 ms  20.431 ms  20.409 ms
     4  172.16.0.1 (172.16.0.1)  30.678 ms  30.654 ms  30.635 ms
     5  * * *
     6  * * *
     7  * * *
     8  * 203.0.113.4 (203.0.113.4)  100.123 ms *

    Hops one through four produced normal responses, possibly indicating that the network between the host and your Internet Service Provider (ISP) has no issues. Hops five through seven received no response. Finally, hop eight received only one response out of three requests, and the one response took significantly longer. This often indicates that there are some network issues at or near the DNS server.

Validate​

Depending on the endpoint you are trying to reach, you can use different methods to validate the results. For example, if you are observing issues near the DNS server, you can try to specify a well-known DNS server such as 8.8.8.8 (Google Public DNS) to test if it improves the connection. If it does, this can help validate the initial traceroute results pointed towards a DNS issue.